Firefly-II Self-Powered Transmitter - A "plunger" attached to the key knob drives a tiny generator in the base. Pumping the key to send Morse code generates the power to put it on the air!
JA1IXI operating his self-powered transmitter
JA1IXI operating the Firefly-II
JR7HAN working JA1IXI using low SWR short whip
Fujiyama 40M & 17M QRP rigs
JL1KRA's Pixie-2 and direct conversion TA-7358 rigs
Germanium transistor milliwatt transceiver
Homebrew contest: JJ1INO 7-10MHz CW Rig
Homebrew contest: JK1XKP (top) & JR8DAG 6 Meter AM Transceivers